populating 2d array with two 1d arrays in java

Question

I have 2 1d arrays and im trying to populate them into a single 2d array in JAVA.

For instance:

x[] = {2,5,7,9}
y[] = {11,22,33,44}

The results should then be:

result[][] = {{2,5,7,9}, {11,22,33,44}}

How do I go about this? I currently have something like this:

for(int row = 0; row < 2; row++) {
    for(int col = 0; col == y.length; col++) {
        ???
    }
}

Im sort of stuck from there...

Juvanis · Accepted Answer · 2012-02-17 07:36:43Z

15

2D array is an array of arrays. So why don't you try this?

int result[][] = {x,y};

And to make sure that it is so simple and works, test this:

for(int i=0; i<result.length; i++)
{
    for(int j=0; j<result[0].length; j++)
        System.out.print(result[i][j]+ " ");
    System.out.println();
}

edited Feb 17, 2012 at 7:36

answered Feb 17, 2012 at 7:31

Juvanis

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1 Comment

Kuldeep Jain Over a year ago

:) Why people are giving other answers. +1 for this one.

Baris Akar · Accepted Answer · 2012-02-17 07:33:43Z

3

Try this:

ArrayList<Integer[]> tempList = new ArrayList<Integer[]>();

tempList.add(x);
tempList.add(y);

Integer result[][] = new Integer[tempList.size()][];
result = tempList.toArray(tempList);

answered Feb 17, 2012 at 7:33

Baris Akar

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1 Comment

Baris Akar Over a year ago

the arraylist is just a temporary container for the arrays. you can add multiple arrays of different sizes to the arraylist and get the corresponding 2D-array from it afterwards using toArray(). but the answer of deporter is clearly simpler if it fits your needs.

Sunil Kumar B M · Accepted Answer · 2012-02-17 07:25:10Z

1

You have to revert the row and column indices

for(int row = 0; row < 2; row++)
{
    for(int col = 0; col = y.length; col++)
    {
        ....
    }
}

answered Feb 17, 2012 at 7:25

Sunil Kumar B M

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